# std::experimental::source_location::line

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< cpp‎ | experimental‎ | source location

constexpr std::uint_least32_t line() const noexcept; |  | (library fundamentals TS v2)

Returns the line number represented by this object.

### Parameters

(none)

### Return value

The line number represented by this object.

### Example

Run this code

    #include <experimental/source_location>
    #include <iostream>
    #include <string_view>
    using std::experimental::source_location;

    inline void cur_line(
        const std::string_view message = "",
        const source_location& location = source_location::current())
    {
        std::cout
            << location.line() // <- the call-site line #
            << ") "
            << message;
    }

    int main()
    {
        cur_line("++" "\n");
        cur_line(); std::cout << "Hello," "\n";
        cur_line(); std::cout << "C++20!" "\n";
        cur_line("--" "\n");
    }

Output:

    18) ++
    19) Hello,
    20) C++20!
    21) --

### See also

column | return the column number represented by this object (public member function)
file_name | return the file name represented by this object (public member function)
function_name | return the name of the function represented by this object, if any (public member function)
C++ documentation for Filename and line information

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